GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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Equivalent length from the first branch to the furthest piping (1)
Height difference
between outdoor
unit and indoor unit
Height difference between indoor units (m)
Maximum length of Main pipe(2)
From IDU to its nearest branch (3)
Notices:
（1）. Normally, the pipe length from the first branch of IDU to the farthest IDU is 40m. When those
three conditions as below are satisfied, the length can reached 90m.
① Actual length of pipe in total: L1+L2x2+L3x2+L4x2+…+L9x2+a+b+…+i+j≤1000m;
②Length between each IDU and its nearest branch a, b, c, d, e, f, g, h, i, j≤40m;
③ Difference between the pipe length from the first branch of IDU to the farthest IDU and the
pipe length from the first branch of IDU to the nearest IDU: L10-L11≤40m.
（2）. When the maximum length of the main pipe from ODU to the first branch of IDU is≥90m, then
adjust the pipe size of the gas pipe and liquid pipe of main pipe according to the following table.
No need to enlarge pipe size
No need to enlarge pipe size
No need to enlarge pipe size
No need to enlarge pipe size
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